TV Show Game of Thrones Season 7 has built up rather an odd tradition over time, slipping in a spree of musical technology cameos amidst the inappropriate lands of Westeros. Previous seasons, indeed, have seen appearances from the wants of Gary Lightbody of Snow Patrol, Will Winner from Coldplay, Sigur , and Mastodon; it now looks like Education Sheeran has joined those ranks. Showrunners David Benioff and Dan Weiss unveiled the news at the sport of Thrones SXSW snowboard, where…